Yes, the sample will need slight modifications to be introduced. I've got a better idea though -- please try to modify the sample in the following way to make it only act as a server and check if it exposes the same issue if your client connects to it and requests renegotiation (let's assume that synchronous mode is used for testing):

It seems to me that the client application you use sends incorrect signature during client verification routine. Can this application be downloaded from somewhere, so that we could investigate the issue in our environment?

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